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2 Sheets-Sheet 1. P. B. DELANY.

TELEGRAPHIG TRANSMITTING APPARATUS Patented Apr. 21, T 1885..

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WITNESSES INVENTOR a, Patricia B.,DeZany.

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(No Model.) 2 SheetsSheet '2.

A P. B. DELANY.

' TELEGRAPHIG TRANSMITTING APPARATUS. N0. 316,125, Patented Apr. 21, 1885.

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WITNESSES JNVEJVTOR W I I PatricirBDeZany.

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UNITED STATES PATENT PATRICK B. DELANY, OF NElV YORK, N. Y., ASSIGNOR TO THE STANDARD MULTIPLEX TELEGRAPH COMPANY, OF SAME PLACE.

TELEGRAPHIC TRANSWHTTBNG APPARATUS.

SPECIFICATION forming par; of Letters Patent 316,125,6l15e5l April 21,1885.

Application filed February 16, 1884. (X model.)

To all whom it may concern;

Be it known that I, PATRIOKB. DELANY, of the city, county, and State of New York, have invented certain new and useful Im- 5 provements in Telegraphic Transmitting Ap paratus, of which the following is a specification.

My invention relates to that class of transmitters in which an armature-lever actuated by an electro-magnet, in the circuit of which a key is placed, is used to throw the battery upon the line. In arrangements of this character heretofore the armature has been provided with an adjusting-spring, and usually,

I 5 instead of transmitting from the ordinary rigid contacts against which the vibrating transmitting-armature works, it is customary to supplement the electrodes or rigid points of contact by yielding contacts, which will close the circuit more securely and remedy the dei'ects in the contact caused by the rebound of the lever from a rigid limiting-point or contact-stop under the influence of its spring. These yielding contacts are liable to vibrate under a sudden blow or withdrawal of the armature.

The object of my invent-ion is to insure an absolutely perfect contact by causing the armaturedever to be held tightly and firmly 0 against its stop by the full power of the attracting-magnet, and I dispense with the retractile spring,which tends to lessen the firnr ness of its contact.

Under my invention, also, the lever moves with the greatest rapidity and precision from one stop to the other in response to the movement of the operators key, and a substan tially equal pressure on both its contactstops is obtained regardless of variations in the 0 strength of the local battery in which the key is placed.

The details of my invention are fully set forth below.

Figure 1 is a diagram View illustrating one 5 form of my invention, and Fig. 2 asimilar View illustrating another form of the invention.

In Letters Patent of the United States No. 286,278, granted October 9, 1883, I have shown a synchronous system of telegraphy to which the particular arrangement illustrated for transmitting with reversecurrents is well adapted. I have therefore indicated in the drawings diagrammatically in each figure a table of contacts, A, a rotating armature-disk, B, and atrailing contactfinger, a, which traverses a series of contacts on the table, and

I refer to said patent for a full exposition of this subject. The invention, however, is not limited to that particular system, but is ap- 6c plicable to the transmission of messages in any of the well-known telegraphic systems.

It is therefore deemed unnecessary to particularly describe any system, as the operation of my invention will be perfectly plain to those skilled in the art.

Referring, first, to Fig. 1, the transmittingbattery MB is shown as arranged for reverse transmission. It is grounded in the middle, and its opposite poles are connected to opposite contactstops, c d, between which a freelyvibrating armature, c, vibrates. This armature is connected through the linef, contacts, and trailing-finger of my synchronous system with the main line. The transmitting-key Kis 7 connected with one pole of a local battery, LB. Its frontstop is connected in a branch circuit, 9, which runs from the stop through the coil of an independent magnet, O, to the opposite pole of the battery. Its back stop is connected in another branch circuit which runs from the stop through the coil of an independent magnet, M, to the opposite pole of the battery. The freely-vibrating armature c is arranged between these opposed magnets, and is acted upon by them. \Vhen the key is upon its front stop, the magnet O firmly and promptly draws the free armature against the contact (1, hold ing it there with a uniform unvarying pressure and putting one pole of the main battery MB to line. \Vhen the key is thrown on its back stop, the magnet O is demagnetized, and the magnet M is energized and promptly draws the armature against its contact 0, thus putting the other pole of the battery to line. As the armature is a freely-vibrating one without bias and without a retractile spring, it remains in either of the positions into which it is drawn, and is held with unvarying pressure upon its contacts. This method of transmission gives the most perfect results, and prevents any weakness or uncertainty of contact between the transmitting-electrodes. This arrange ment is obviously adaptable for transmission from one pole of the battery only.

In Fig. 2 I have shown an arrangementsubstantially identical in its principal features. Under this arrangement,instead ofthe magnets M O, I employ a polarized relay, which is worked by a split local battery, LB. The main battery MBissent to line in the same way. In this instance the armature 0 may also be said to become a freely-vibrating one, because it moves from one contact to the other under the combined influence of magnetic attraction and repulsion, as is well understood. Vith this arrangement also the contacts are firm, and most satisfactory transmission results. I prefer the arrangement, however, which is illustrated in Fig. 1, for the reason that each magnet is independent. No reversals occur in the coil of either magnet, and one magnet is resting while the other is at work. For this reason I consider that it possesses substantial advantages over the arrangement shown in Fig. 2, although, as before remarked, in the main principles of organization and operation they are identical.

In an application filed by me October 22, 1883, No. 109,716, I have shown an arrange ment in whiclra freely-vibrating armature is vibrated by independent alternately energized magnets, and I therefore make no such claim in this application.

I claim as my in\'ention 1. The local transmitting arrangement consisting of the combination, substantially as set forth, of a transmitting-key, a local circuit in which the key is included, which circuit is closed when the key is on its front stop, aseparate or branch circuit which is closed when the key is on its back stop, a freely-vibrating armature which is acted upon electromagnetrate or branch circuit which is closed when U the key is on its back stop, magnetic helices and cores in said local circuits, a non-resilient armature controlled by said helices and cores, a main line, and a transmitting-battery which is thrown upon the line by the vibrations of the armature, which occur in response to the manipulation of the transmitting-key.

3. The combination, substantially as set forth, of the transmitti ng k ey,two independent electro-magnets which are alternately ener gized by the manipulations of thekey,the local circuits of said magnets, a freely-vibrating armature acted upon by said magnets, the main line, and the transmitting-battery which is thrown upon the line by the vibrations of the armature.

4. The combination, substantially as set forth, of the transmitting-key, the independent magnets M 0, their local circuits, the freely-vibrating armature acted upon by said magnets, the split main battery MB, the poles of which are electrically connected with the opposite contactstops, 0 (Z, against which the vibrating armature works, and the main line connected with said armature.

In testimony whereot I have hereunto subscribed my name this 20th day of February, A. D. 1884..

PATRICK B. DELANY.

\Vitnesses:

Enwn. A. CALAILLN, H. D. Manson. 

